Detener el protector de pantalla y la hibernación temporalmente en VB.Net

Question

Tengo una tarea de sincronización muy larga duración que no puede ser interrumpida por el protector de pantalla o los modos de ahorro de energía agresivos. Quiero hacer una sola llamada a la API para detener el modo de ahorro de energía y luego restaurarla una vez que la tarea se realiza.

El siguiente código se peaced juntas de varios otros puestos pero no tiene ningún efecto sobre la configuración de administración de energía de XP. ¿Qué estoy haciendo mal? TIA!

Private Declare Function SetThreadExecutionState Lib "kernel32" (ByVal esFlags As Long) As Long

Public Enum EXECUTION_STATE As Integer

    ES_CONTINUOUS = &H80000000
    ES_DISPLAY_REQUIRED = &H2
    ES_SYSTEM_REQUIRED = &H1
    ES_AWAYMODE_REQUIRED = &H40

End Enum

Public Shared Sub PowerSaveOff()
    SetThreadExecutionState(EXECUTION_STATE.ES_DISPLAY_REQUIRED Or EXECUTION_STATE.ES_CONTINUOUS)
End Sub

Public Shared Sub PowerSaveOn()
    SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS)
End Sub

Aquí están los ajustes de pantalla y sistemas PowerMode: alt texto http://img87.imageshack.us/img87/1600/25251376.jpg alt texto http://img403.imageshack.us/img403/8145/73347627.jpg

Answer 1

añadieron EXECUTION_STATE.ES_SYSTEM_REQUIRED, que "obliga al sistema a estar en el estado de trabajo restableciendo el sistema de temporizador de inactividad", y evita que el sistema entre en un estado de ahorro de energía. También ha cambiado la convención de llamada de API para utilizar EXECUTION_STATE, envuelto todo en una clase sencilla utilidad con algún tipo de documentación.

''' <summary>
''' Simple power manager class that enables applications to inform the system
''' that it is in use, thereby preventing the system from entering the sleeping
''' power state or turning off the display while the application is running.
''' </summary>
Public Class PowerManager

#Region " Private Sub New "
    Private Sub New()
        'keep compiler from creating default constructor to create utility class
    End Sub
#End Region

    ''' <summary>
    ''' Enables applications to inform the system that it is in use, thereby preventing the system from entering the sleeping power state or turning off the display while the application is running.
    ''' </summary>
    ''' <param name="esFlags">The thread's execution requirements. This parameter can be one or more of the EXECUTION_STATE values.</param>
    ''' <returns>
    ''' <para>If the function succeeds, the return value is the previous thread execution state, as a EXECUTION_STATE value.</para>
    ''' <para>If the function fails, the return value is NULL.</para>
    '''</returns>
    ''' <remarks>
    ''' <para>This function does not stop the screen saver from executing.</para>
    ''' <para>http://msdn.microsoft.com/en-us/library/aa373208.aspx</para>
    ''' </remarks>
    Private Declare Function SetThreadExecutionState Lib "kernel32" (ByVal esFlags As EXECUTION_STATE) As EXECUTION_STATE

    Public Enum EXECUTION_STATE As Integer

        ''' <summary>
        ''' Informs the system that the state being set should remain in effect until the next call that uses ES_CONTINUOUS and one of the other state flags is cleared.
        ''' </summary>
        ES_CONTINUOUS = &H80000000

        ''' <summary>
        ''' Forces the display to be on by resetting the display idle timer.
        ''' </summary>
        ES_DISPLAY_REQUIRED = &H2

        ''' <summary>
        ''' Forces the system to be in the working state by resetting the system idle timer.
        ''' </summary>
        ES_SYSTEM_REQUIRED = &H1

    End Enum

    Public Shared Function PowerSaveOff() As EXECUTION_STATE
        Return SetThreadExecutionState(EXECUTION_STATE.ES_SYSTEM_REQUIRED Or EXECUTION_STATE.ES_DISPLAY_REQUIRED Or EXECUTION_STATE.ES_CONTINUOUS)
    End Function

    Public Shared Function PowerSaveOn() As EXECUTION_STATE
        Return SetThreadExecutionState(EXECUTION_STATE.ES_CONTINUOUS)
    End Function

End Class

Public Class Form1

    Private _cancel As Boolean

    Private Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click

        'set system standby to one minute

        _cancel = False

        PowerManager.PowerSaveOff()

        Do Until _cancel
            My.Application.DoEvents()
        Loop

        PowerManager.PowerSaveOn()

        'do not forget to restore your power settings

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        _cancel = True
    End Sub

End Class

Answer 2

Esto funciona para mí:

Private Const SPI_SETSCREENSAVEACTIVE = 17
Private Const SPI_SETSCREENSAVETIMEOUT = 15
Private Const SPIF_SENDWININICHANGE = &H2
Private Const SPIF_UPDATEINIFILE = &H1
Private Declare Function SystemParametersInfo Lib "user32" Alias "SystemParametersInfoA" (ByVal uAction As Long, ByVal uParam As Long, ByVal lpvParam As Long, ByVal fuWinIni As Long) As Long

Private Sub Form_Load()
Call SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 0, 0, SPIF_UPDATEINIFILE + SPIF_SENDWININICHANGE)
End Sub

Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
Call SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 1, 0, SPIF_UPDATEINIFILE + SPIF_SENDWININICHANGE)
End Sub

Answer 3

Microsoft.Win32.RegistryKey rkScreenSaver =
        Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@" Control Panel\Desktop", true );
if ( (string)rkScreenSaver.GetValue( "ScreenSaveActive" ) == "1" )
{
   rkScreenSaver.SetValue( "ScreenSaveActive", "0" );
   rkScreenSaver.Close( );
}

Esto debería funcionar para usted.

De forma alternativa por qué no extender el tiempo para el protector de pantalla a 10 minutos?